Titanium dioxide surface modified with both palladium and fluoride as an efficient photocatalyst for the degradation of urea
DC Field | Value | Language |
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dc.contributor.author | Kim, Hyoung-il | - |
dc.contributor.author | Kim, Kitae | - |
dc.contributor.author | Park, Soona | - |
dc.contributor.author | Kim, Wooyul | - |
dc.contributor.author | Kim, Seungdo | - |
dc.contributor.author | Kim, Jungwon | - |
dc.date.available | 2021-02-22T06:46:17Z | - |
dc.date.issued | 2019-01 | - |
dc.identifier.issn | 1383-5866 | - |
dc.identifier.issn | 1873-3794 | - |
dc.identifier.uri | https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/3883 | - |
dc.description.abstract | TiO2 surface modified with both Pd nanoparticles and fluorides (F-TiO2/Pd) was prepared and applied as a photocatalyst in the degradation of urea. Various surface analysis techniques, including X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and energy-dispersive X-ray spectroscopy, were used to verify the coexistence of Pd nanoparticles and fluorides on the surface of TiO2 in F-TiO2/Pd. F-TiO2/Pd showed a higher photocatalytic activity than those of bare TiO2 and single-component-modified TiO2 photocatalysts such as fluorinated TiO2 (F-TiO2) and Pd-loaded TiO2 (Pd/TiO2). The higher urea degradation efficiency of F-TiO2/Pd is ascribed to the enhanced production of hydroxyl radicals ((OH)-O-center dot) by the synergistic action of the surface Pd and fluoride. Pd nanoparticles and fluorides facilitate the transfer of valence band holes (h(vb)(+)) and their reaction with water molecules, respectively, synergistically enhancing the production of (OH)-O-center dot. The photocatalytic activity of F-TiO2/Pd for the degradation of urea increased upon increasing the fraction of the fluorinated TiO2 surface, which is higher at higher fluoride concentrations and lower pH. Although Pt/TiO2 showed higher photocatalytic activity for the degradation of urea than those of Pd/TiO2 and Au/TiO2, the strong positive effect of fluoride complexation was only exhibited by Pd/TiO2 (a slight positive effect and a negative effect were observed for Au/TiO2 and Pt/TiO2, respectively). As a result, the degradation of urea proceeded more rapidly in a UV-irradiated suspension of F-TiO2/Pd than when any of other photocatalysts (i.e., bare TiO2, Pd/ TiO2, F-TiO2, Au/TiO2, F-TiO2/Au, Pt/TiO2, and F-TiO2/Pt) were used under the same conditions. The first-order degradation rate constants (k) of urea depending on the type of TiO2 were as follows: 0.097 h(-1) for bare TiO2, 0.158 h(-1) for Pd/TiO2, 0.151 h(-1) for F-TiO2, 0.351 h(-1) for F-TiO2/Pd, 0.173 h(-1) for Au/TiO2, 0.223 h(-1) for F-TiO2/Au, 0.240 h for Pt/TiO2, and 0.165 h(-1) for F-TiO2/Pt, respectively. In addition, F-TiO2/Pd proved to be stable in repeated urea degradation cycles. | - |
dc.format.extent | 8 | - |
dc.language | 영어 | - |
dc.language.iso | ENG | - |
dc.publisher | ELSEVIER SCIENCE BV | - |
dc.title | Titanium dioxide surface modified with both palladium and fluoride as an efficient photocatalyst for the degradation of urea | - |
dc.type | Article | - |
dc.publisher.location | Netherlands | - |
dc.identifier.doi | 10.1016/j.seppur.2018.07.058 | - |
dc.identifier.scopusid | 2-s2.0-85051017015 | - |
dc.identifier.wosid | 000449133600064 | - |
dc.identifier.bibliographicCitation | SEPARATION AND PURIFICATION TECHNOLOGY, v.209, pp 580 - 587 | - |
dc.citation.title | SEPARATION AND PURIFICATION TECHNOLOGY | - |
dc.citation.volume | 209 | - |
dc.citation.startPage | 580 | - |
dc.citation.endPage | 587 | - |
dc.type.docType | Article | - |
dc.description.isOpenAccess | N | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Engineering | - |
dc.relation.journalWebOfScienceCategory | Engineering, Chemical | - |
dc.subject.keywordPlus | TIO2 PHOTOCATALYSIS | - |
dc.subject.keywordPlus | FLUORINATED TIO2 | - |
dc.subject.keywordPlus | CATALYTIC-OXIDATION | - |
dc.subject.keywordPlus | ROOM-TEMPERATURE | - |
dc.subject.keywordPlus | WATER | - |
dc.subject.keywordPlus | NANOPARTICLES | - |
dc.subject.keywordPlus | MECHANISM | - |
dc.subject.keywordPlus | URINE | - |
dc.subject.keywordPlus | FORMALDEHYDE | - |
dc.subject.keywordPlus | CHLORINATION | - |
dc.subject.keywordAuthor | Photocatalysis | - |
dc.subject.keywordAuthor | Titanium dioxide | - |
dc.subject.keywordAuthor | Palladium loading | - |
dc.subject.keywordAuthor | Fluoride complexation | - |
dc.subject.keywordAuthor | Urea degradation | - |
dc.identifier.url | https://www.sciencedirect.com/science/article/pii/S138358661831390X?via%3Dihub | - |
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